Just looking at steam cards and then I read this
Notice this part
It seems like it could have been a setup, but I don't know.
I never knew this information before and figured everyone would want to know.

Honestly, it's covered in bugs and the whole zombies hitting you on the back (EVEN WITH THE FRIGGEN SHIELD) and going down from one hit is still a thing on the PC port.
Even if there are a few bugs and all. I love the map. Great Easter eggs. Amazing story line tie ins. Amazing, honestly.

Richtofen was at The Giant before the Origins map right? Well in the way that he was Maxi's student/companion/scientist. I'd assume that at least. If so, that means that the MOTD crew showed up a lot earlier than Origins.

Introduction
In Zetsubou no Shima fighter air planes can be seen attacking one another and going between dimensions/rift tears/etc.
What was the importance of this being shown now? Is it major? Can it explain anything?
It is important. Yes it is major now, and I believe much more later as the DLC is released. For right now, it can explain two things.
1. With these "jumps" (for lack of a better explanation) in Zetsubou, we can see that these jumps can apply to aircrafts.
2. The crew in MOTD may have just possibly found themselves in this jump during one of their cycles.
Theory/Ideas
If the MOTD crew has managed to go through these jumps, with the new option of infinite dimensions. Who's to say that they didn't jump to The Giant because of it?
The proof is right there. Sitting just on top of the building.
How this can lead to the blood vials
With all of these pieces to the puzzle out, it's not hard to go even further with it.
Richtofen has two blood vials that has the cell numbers to two of the characters in MOTD. That's not new news. Although we haven't been able top explain it.
If the MOTD crew took one of these jumps to The Giant. With all of the knowledge Richtofen has; he could have easily been at the right dimension at the right time.
It's easy to assume that if the MOTD crew made it to The Giant, they were more than likely taken prisoners and experimented on. That would have made getting the blood extremely easy without question from anyone in Group 935.
In conclusion/ TL;DR
The MOTD crew jumped through a rift. Landed in The Giant. Richtofen was there to get the blood he needed without raising suspicion because they were already being tested on.
It's just a theory, but to me it makes a lot of sense.

EDIT: Holy crap this forum took off.. The website hasn't sent me a single notification about this so apologies for not being able to respond
Also. I took out my original picture and used the better one given to me by PINNAZ. Thank you to the wonderful mod who saved the post!
We all know this image.
Little to no actual progress has been made to this cipher. Hopefully one day someone can come along and solve this.